23981687 has 2 divisors, whose sum is σ = 23981688. Its totient is φ = 23981686.

The previous prime is 23981647. The next prime is 23981729. The reversal of 23981687 is 78618932.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 23981687 - 2⁶ = 23981623 is a prime.

It is a super-2 number, since 2×23981687² = 1150242622731938, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23981647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11990843 + 11990844.

It is an arithmetic number, because the mean of its divisors is an integer number (11990844).

Almost surely, 2^23981687 is an apocalyptic number.

23981687 is a deficient number, since it is larger than the sum of its proper divisors (1).

23981687 is an equidigital number, since it uses as much as digits as its factorization.

23981687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 44.

The square root of 23981687 is about 4897.1100661513. The cubic root of 23981687 is about 288.3765289586.

The spelling of 23981687 in words is "twenty-three million, nine hundred eighty-one thousand, six hundred eighty-seven".